Smart Flow Meter

Smart flow meter is an inductive meter that measures the volume flow of conductive medium in the tube according to Faraday's law of electromagnetic induction. Embedded technology of single chip microcomputer is used to realize digital excitation. At the same time, CAN field bus is used on the electromagnetic flow meter. It is a domestic initiative and the technology is achieved. Leading domestic level. HPLDE electromagnetic flowmeter can output 4～20mA current signal for recording, regulation and control while satisfying the on-site display. Now it has been widely used in chemical industry, environmental protection, metallurgy, medicine, papermaking, water supply and drainage and other industrial technologies and management. department.

HPLDE electromagnetic flowmeter can measure the flow rate of general conductive liquid, but also measure the volume flow rate of liquid-solid two-phase flow, high viscosity liquid flow and salt, strong acid, strong alkali liquid.

Electromagnetic flowmeter performance characteristics â—† instrument structure is simple, reliable, no moving parts, long working life.

â—† No blocking flow blocking parts, no pressure loss and fluid blocking phenomenon.

â—† No mechanical inertia, fast response, good stability, can be applied to automatic detection, adjustment and program control system.

â—† The measurement accuracy is not affected by the type of the measured medium and the physical parameters such as temperature, viscosity, density, and pressure.

â—† The use of PTFE or rubber lining and different combinations of Hc, Hb, 316L, Ti and other electrode materials can meet the needs of different media.

â—†A variety of flow meter models such as pipeline type and plug-in type are available.

â—† Use EEPROM memory, measurement and operation data storage protection is safe and reliable.

â—† With integration and separation of two types.

â—† High-resolution LCD backlight display.

Electromagnetic flowmeter technical parameters ◆ Instrument accuracy: Pipeline 0.5, 1.0; plug-in 2.5 ◆ measuring medium: conductivity of more than 5μS/cm of various liquid and liquid-solid two-phase fluid.

◆Flow rate range: 0.2～8m/s

â—†Working pressure: 1.6MPa

◆Environmental temperature: -40°C～+50°C

◆ Medium temperature: Teflon lining ≤180°C

Rubber lining ≤65°C

Explosion-proof mark: ExmibdIIBT4

â—†Explosion proof number: GYB01349

◆ External magnetic interference: ≤400A/m

â—† Shell protection: integrated type: IP65;

Separate type: sensor IP68 (5 meters underwater, rubber lining only)

Converter IP65

◆Output signal: 4～20mA.DC, load resistance 0～750Ω

◆ Communication output: RS485 or CAN bus ◆ Electrical connection: M20 × 1.5 internal thread, φ10 cable hole ◆ Power supply voltage: 90～220V.AC, 24±10%V.DC

◆Maximum power consumption: ≤10VA

Electromagnetic flowmeter instrument selection â—† Range range to confirm that the general industrial electromagnetic flowmeter measured medium flow rate is appropriate 2 ~ 4m / s, in special circumstances, the minimum flow rate should not be less than 0.2m / s, the maximum should not be greater than 8m / s. If the medium contains solid particles, the common flow rate should be less than 3m/s to prevent excessive rubbing of the lining and electrodes; for viscous fluids, the flow rate can be selected to be greater than 2m/s, and the larger flow rate helps to automatically eliminate sticking on the electrodes. The role of stagnation will help improve measurement accuracy.

Under the condition that the quantum Q has been determined, the size of the flowmeter bore D can be determined according to the range of the above-mentioned flow velocity V, and its value is calculated by the following equation:

Q=Ï€D2V/4

Q: Flow rate (m2/h) D: Pipe inside diameter V: Flow rate (m/h)

The range Q of the electromagnetic flowmeter should be greater than the expected maximum flow rate, and the normal flow rate should be slightly greater than 50% of the full scale of the flowmeter.

Electromagnetic Flowmeter Selection Model Size (mm) Flow Range (m3/h) Aperture (mm) Aperture (mm) Flow Range (m3/h)

HP-LDE15 DN15 0.32-6.36 HP-LDE/LCD450 DN450 286.13-5722.65

HP-LDE20 DN20 0.57-11.30 HP-LDE/LCD500 DN500 353.25-7065.00

HP-LDE25 DN25 0.88-17.66 HP-LDE/LCD600 DN600 508.68-10173.60

HP-LDE32 DN32 1.45-28.94 HP-LDE/LCD700 DN700 692.37-13847.40

HP-LDE40 DN40 2.26-45.22 HP-LDE/LCD800 DN800 904.32-18086.40

HP-LDE50 DN50 3.53-70.65 HP-LDE/LCD900 DN900 1144.53-22890.60

HP-LDE65 DN65 5.97-119.40 HP-LDE/LCD1000 DN1000 1413.00-28260.00

HP-LDE80 DN80 9.04-180.86 HP-LDE/LCD1200 DN1200 2034.72-40694.40

HP-LDE100 DN100 14.13-282.60 HP-LDE/LCD1400 DN1400 2769.48-55389.60

HP-LDE125 DN125 22.08-441.56 HP-LDE/LCD1600 DN1600 3617.28-72345.60

HP-LDE150 DN150 31.79-635.85 HP-LDE/LCD1800 DN1800 4578.12-91562.40

HP-LDE/LCD200 DN200 56.52-1130.40 HP-LDE/LCD2000 DN2000 5652.00-113040.00

HP-LDE/LCD250 DN250 88.31-1766.25 HP-LDE/LCD2200 DN2200 6838.92-136778.40

HP-LDE/LCD300 DN300 127.17-2543.40 HP-LDE/LCD2400 DN2400 8138.88-162777.60

HP-LDE/LCD350 DN350 173.09-3461.85 HP-LDE/LCD2600 DN2600 9551.88-191037.60

HP-LDE/LCD400 DN400 226.08-4521.60

Code electrode material K1 316L

K2 HB

K3 HC

K4 titanium K5 é’½ K6 platinum alloy K7 stainless steel coated tungsten carbide code lining material C1 PTFE F4

C2 FEP F46

C3 polyfluoroethylene FS

C4 polybutadiene rubber C5 polyurethane rubber code function E1 0.3 E2 0.5 E3 1 F1 4-20Madc, load ≤750Ω

F2 0-3khz, 5v active, variable pulse width, output high-end effective frequency F3 RS485 interface T1 normal temperature type T2 high temperature type T3 ultra high temperature type P1 0.6MPa

P2 1.0MPa

P3 1.6MPa

P4 4.0MPa

D1 220VAC±10%

D2 24VDC±10%

J1 integral structure J2 split body structure J3 Explosion-proof integrated structure electromagnetic flowmeter's main advantages are as follows:

1) The sensor structure of the electromagnetic flowmeter is simple, there are no moving parts in the measuring tube, and there are no throttling parts that impede the flow of fluid. Therefore, when the fluid passes through the flow meter, it does not cause any additional pressure loss, and is one of the lowest energy consumption flow meters in the flow meter.

2) The flow rate of fouling medium, corrosive medium and suspension liquid-solid two-phase flow can be measured. This is due to the unobstructed flow components inside the instrument measuring tube. The measuring tube lining and electrodes are in contact with the measured fluid. The material can be selected according to the nature of the measured fluid. For example, with polytrifluoroethylene or PTFE as the inner lining, it can measure various corrosive media such as acids, alkalis, and salts; wear-resistant rubber as the inner lining is particularly suitable for measuring wear with solid particles. Larger slurry, cement slurry, etc. Liquid-solid two-phase flow, and various suspended liquids with fiber liquids and pulps.

3) The electromagnetic flowmeter is a kind of volume flow measuring instrument. In the measurement process, it is not affected by the measured temperature, viscosity, density of the medium (in a certain range). Therefore, after the electromagnetic flow meter is calibrated by water, it can be used to measure the flow of other conductive liquids.

4) The output of the electromagnetic flow meter is only proportional to the average flow velocity of the measured medium, but is independent of the flow state (laminar flow or turbulent flow) under symmetrical distribution. Therefore, the range of the electromagnetic flowmeter is very wide, with a measuring range of up to 100:1, and some even reach a flowable range of 1000:1.

5) The electromagnetic flowmeter has no mechanical inertia and reacts sensitively. It can measure the instantaneous pulsating flow, and can also measure the flow in both positive and negative directions.

6) The scope of the industrial electromagnetic flowmeter is very wide, from a few millimeters up to a few meters. Moreover, the real-time flow calibration equipment with a caliber of up to 3m in China has laid a foundation for the application and development of electromagnetic flowmeters.

The main drawbacks of electromagnetic flowmeters are still as follows.

1) It cannot be used to measure gases, steam, and liquids containing large amounts of gas.

2) It cannot be used to measure liquid media with very low electrical conductivity. For media such as petroleum products or organic solvents, electromagnetic flowmeters are still powerless.

3) Electromagnetic flowmeters for general industrial use cannot be used for measuring high-temperature medium due to the restrictions of measuring tube lining materials and electrical insulating materials; if they have not been specially treated, they cannot be used for measurement of low-temperature medium to prevent condensation outside the measuring tube. (frosting) destroys insulation.

4) The electromagnetic flowmeter is susceptible to external electromagnetic interference.